Other Balance Sheet Items Other Balance Sheet Non-Current Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Other Liabilities Disclosure [Abstract]
Deferred Income Taxes and Other Liabilities, Noncurrent	$ 90,335	$ 308,112
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List]	us-gaap:OtherLiabilitiesNoncurrent	us-gaap:OtherLiabilitiesNoncurrent
Operating Lease, Liability, Noncurrent	$ 5,159	$ 4,564
Other Liabilities, Noncurrent	$ 95,494	$ 312,676
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List]	us-gaap:OtherAssets	us-gaap:OtherAssets